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- /* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
- * Copyright (C) 1992-1993 Jean-loup Gailly
- * The unzip code was written and put in the public domain by Mark Adler.
- * Portions of the lzw code are derived from the public domain 'compress'
- * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
- * Ken Turkowski, Dave Mack and Peter Jannesen.
- *
- * See the license_msg below and the file COPYING for the software license.
- * See the file algorithm.doc for the compression algorithms and file formats.
- */
-
- static char *license_msg[] = {
- " Copyright (C) 1992-1993 Jean-loup Gailly",
- " This program is free software; you can redistribute it and/or modify",
- " it under the terms of the GNU General Public License as published by",
- " the Free Software Foundation; either version 2, or (at your option)",
- " any later version.",
- "",
- " This program is distributed in the hope that it will be useful,",
- " but WITHOUT ANY WARRANTY; without even the implied warranty of",
- " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
- " GNU General Public License for more details.",
- "",
- " You should have received a copy of the GNU General Public License",
- " along with this program; if not, write to the Free Software",
- " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
- 0};
-
- /* Compress files with zip algorithm and 'compress' interface.
- * See usage() and help() functions below for all options.
- * Outputs:
- * file.z: compressed file with same mode, owner, and utimes
- * file.Z: same with -Z option (old compress format)
- * or stdout with -c option or if stdin used as input.
- * If the OS does not support file names with multiple dots (MSDOS, VMS) or
- * if the output file name had to be truncated, the original name is kept
- * in the compressed .z file. (Feature not available in old compress format.)
- * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-z.
- *
- * For the meaning of all compilation flags, see comments in Makefile.in.
- */
-
- #ifndef lint
- static char rcsid[] = "$Id: gzip.c,v 0.17 1993/03/18 18:14:56 jloup Exp $";
- #endif
-
- #include "tailor.h"
- #include "gzip.h"
- #include "lzw.h"
- #include "revision.h"
- #include "getopt.h"
-
- #include <stdio.h>
- #include <ctype.h>
- #include <sys/types.h>
- #include <signal.h>
- #include <sys/stat.h>
- #include <errno.h>
-
- /* configuration */
-
- #ifndef NO_FCNTL_H
- # include <fcntl.h>
- #endif
-
- #ifdef HAVE_UNISTD_H
- # include <unistd.h>
- #endif
-
- #if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
- # include <stdlib.h>
- #else
- extern int errno;
- #endif
-
- #if defined(DIRENT) || defined(_POSIX_VERSION)
- # include <dirent.h>
- typedef struct dirent dir_type;
- # define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
- # define DIR_OPT "DIRENT"
- #else
- # define NLENGTH(dirent) ((dirent)->d_namlen)
- # ifdef SYSDIR
- # include <sys/dir.h>
- typedef struct direct dir_type;
- # define DIR_OPT "SYSDIR"
- # else
- # ifdef SYSNDIR
- # include <sys/ndir.h>
- typedef struct direct dir_type;
- # define DIR_OPT "SYSNDIR"
- # else
- # ifdef NDIR
- # include <ndir.h>
- typedef struct direct dir_type;
- # define DIR_OPT "NDIR"
- # else
- # define NO_DIR
- # define DIR_OPT "NO_DIR"
- # endif
- # endif
- # endif
- #endif
-
- #ifndef NO_UTIME
- # ifndef NO_UTIME_H
- # include <utime.h>
- # define TIME_OPT "UTIME"
- # else
- # ifdef HAVE_SYS_UTIME_H
- # include <sys/utime.h>
- # define TIME_OPT "SYS_UTIME"
- # else
- struct utimbuf {
- time_t actime;
- time_t modtime;
- };
- # define TIME_OPT ""
- # endif
- # endif
- #else
- # define TIME_OPT "NO_UTIME"
- #endif
-
- #if !defined(S_ISDIR) && defined(S_IFDIR)
- # define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
- #endif
- #if !defined(S_ISREG) && defined(S_IFREG)
- # define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
- #endif
-
- typedef RETSIGTYPE (*sig_type)();
-
- #ifndef O_BINARY
- # define O_BINARY 0 /* creation mode for open() */
- #endif
-
- #ifndef O_CREAT
- /* Pure BSD system? */
- # include <sys/file.h>
- # ifndef O_CREAT
- # define O_CREAT FCREAT
- # endif
- # ifndef O_EXCL
- # define O_EXCL FEXCL
- # endif
- #endif
-
- #define RW_USER 0600 /* creation mode for open() */
-
- #ifndef MAX_PATH_LEN
- # define MAX_PATH_LEN 1024 /* max pathname length */
- #endif
-
- #define MAX_HEADER_LEN 16
- /* max length of a compressed file header, fixed part only */
-
- /* global buffers */
-
- DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
- DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
- DECLARE(ush, d_buf, DIST_BUFSIZE);
- DECLARE(uch, window, 2L*WSIZE);
- #ifndef MAXSEG_64K
- DECLARE(ush, tab_prefix, 1L<<BITS);
- #else
- DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
- DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
- #endif
-
- /* local variables */
-
- int to_stdout = 0; /* output to stdout (-c) */
- int decompress = 0; /* decompress (-d) */
- int force = 0; /* don't ask questions, compress links (-f) */
- int recursive = 0; /* recurse through directories (-r) */
- int verbose = 0; /* be verbose (-v) */
- int quiet = 0; /* be very quiet (-q) */
- int quit_on_tty = 0; /* quit if compressing to or decompressing from a tty */
- int do_lzw = 0; /* generate output compatible with old compress (-Z) */
- int test = 0; /* test .z file integrity */
- int foreground; /* set if program run in foreground */
- char *progname; /* program name */
- int maxbits = BITS; /* max bits per code for LZW */
- int method = DEFLATED;/* compression method */
- int level = 5; /* compression level */
- int exit_code = OK; /* program exit code */
- int save_orig_name; /* set if original name must be saved */
- int last_member; /* set for .zip and .Z files */
- int part_nb; /* number of parts in .z file */
- ulg time_stamp; /* original time stamp (modification time) */
- long ifile_size; /* input file size, -1 for devices (debug only) */
- char *env; /* contents of GZIP env variable */
- char **args = NULL; /* argv pointer if GZIP env variable defined */
-
- long bytes_in; /* number of input bytes */
- long bytes_out; /* number of output bytes */
- char ifname[MAX_PATH_LEN]; /* input filename */
- char ofname[MAX_PATH_LEN]; /* output filename */
- int remove_ofname = 0; /* remove output file on error */
- struct stat istat; /* status for input file */
- int ifd; /* input file descriptor */
- int ofd; /* output file descriptor */
- unsigned insize; /* valid bytes in inbuf */
- unsigned inptr; /* index of next byte to be processed in inbuf */
- unsigned outcnt; /* bytes in output buffer */
-
- struct option longopts[] =
- {
- /* { name has_arg *flag val } */
- /* {"ascii", 0, 0, 'a'}, ascii text mode */
- {"stdout", 0, 0, 'c'}, /* write output on standard output */
- {"decompress", 0, 0, 'd'}, /* decompress */
- {"uncompress", 0, 0, 'd'}, /* decompress */
- /* {"encrypt", 0, 0, 'e'}, encrypt */
- {"force", 0, 0, 'f'}, /* force overwrite of output file */
- {"help", 0, 0, 'h'}, /* give help */
- /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
- /* {"list", 0, 0, 'l'}, list .z file contents */
- {"license", 0, 0, 'L'}, /* display software license */
- {"quiet", 0, 0, 'q'}, /* quiet mode */
- {"recurse", 0, 0, 'r'}, /* recurse through directories */
- {"test", 0, 0, 't'}, /* test compressed file integrity */
- {"verbose", 0, 0, 'v'}, /* verbose mode */
- {"version", 0, 0, 'V'}, /* display version number */
- {"fast", 0, 0, '1'}, /* compress faster */
- {"best", 0, 0, '9'}, /* compress better */
- {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
- {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
- { 0, 0, 0, 0 }
- };
-
- /* local functions */
-
- local void usage OF((void));
- local void help OF((void));
- local void license OF((void));
- local void version OF((void));
- local void treat_stdin OF((void));
- local void treat_file OF((char *iname));
- local int create_outfile OF((void));
- local int do_stat OF((char *name, struct stat *sbuf));
- local char *get_suffix OF((char *name));
- local int get_istat OF((char *iname, struct stat *sbuf));
- local int make_ofname OF((void));
- local int same_file OF((struct stat *stat1, struct stat *stat2));
- local int name_too_long OF((char *name, struct stat *statb));
- local int get_method OF((int in));
- local int check_ofname OF((void));
- local void reset_times OF((char *name, struct stat *statb));
- local void copy_stat OF((struct stat *ifstat));
- local void treat_dir OF((char *dir));
- local void do_exit OF((int exitcode));
- int main OF((int argc, char **argv));
-
- void (*work) OF((int infile, int outfile)) = zip; /* function to call */
-
- #define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
-
- /* ======================================================================== */
- local void usage()
- {
- fprintf(stderr,
- #ifdef LZW
- # ifdef NO_DIR
- "usage: %s [-cdfhLtvVZ19] [-b maxbits] [file ...]\n",
- # else
- "usage: %s [-cdfhLrtvVZ19] [-b maxbits] [file ...]\n",
- # endif
- #else /* !LZW */
- # ifdef NO_DIR
- "usage: %s [-cdfhLtvV19] [file ...]\n",
- # else
- "usage: %s [-cdfhLrtvV19] [file ...]\n",
- # endif
- #endif /* LZW */
- progname);
- }
- /* ======================================================================== */
- local void help()
- {
- static char *help_msg[] = {
- /* -a --ascii ascii text; convert end-of-lines to local OS conventions */
- " -c --stdout write on standard output, keep original files unchanged",
- " -d --decompress decompress",
- /* -e --encrypt encrypt */
- " -f --force force overwrite of output file and compress links",
- " -h --help give this help",
- /* -k --pkzip force output in pkzip format */
- /* -l --list list .z file contents */
- " -L --license display software license",
- " -q --quiet suppress all warnings",
- #ifndef NO_DIR
- " -r --recurse recurse through directories",
- #endif
- " -t --test test compressed file integrity",
- " -v --verbose verbose mode",
- " -V --version display version number",
- " -1 --fast compress faster",
- " -9 --best compress better",
- #ifdef LZW
- " -Z --lzw produce output compatible with old compress",
- " -b --bits maxbits max number of bits per code (implies -Z)",
- #endif
- " file... files to (de)compress. If none given, use standard input.",
- 0};
- char **p = help_msg;
-
- fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
- usage();
- while (*p) fprintf(stderr, "%s\n", *p++);
- }
-
- /* ======================================================================== */
- local void license()
- {
- char **p = license_msg;
-
- fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
- while (*p) fprintf(stderr, "%s\n", *p++);
- }
-
- /* ======================================================================== */
- local void version()
- {
- fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
-
- fprintf(stderr, "Compilation options:\n%s %s ", DIR_OPT, TIME_OPT);
- #ifdef STDC_HEADERS
- fprintf(stderr, "STDC_HEADERS ");
- #endif
- #ifdef HAVE_UNISTD_H
- fprintf(stderr, "HAVE_UNISTD_H ");
- #endif
- #ifdef NO_MEMORY_H
- fprintf(stderr, "NO_MEMORY_H ");
- #endif
- #ifdef NO_STRING_H
- fprintf(stderr, "NO_STRING_H ");
- #endif
- #ifdef NO_SYMLINK
- fprintf(stderr, "NO_SYMLINK ");
- #endif
- #ifdef NO_MULTIPLE_DOTS
- fprintf(stderr, "NO_MULTIPLE_DOTS ");
- #endif
- #ifdef NO_CHOWN
- fprintf(stderr, "NO_CHOWN ");
- #endif
- #ifdef PROTO
- fprintf(stderr, "PROTO ");
- #endif
- #ifdef ASMV
- fprintf(stderr, "ASMV ");
- #endif
- #ifdef DEBUG
- fprintf(stderr, "DEBUG ");
- #endif
- #ifdef DYN_ALLOC
- fprintf(stderr, "DYN_ALLOC ");
- #endif
- #ifdef MAXSEG_64K
- fprintf(stderr, "MAXSEG_64K");
- #endif
- fprintf(stderr, "\n");
- }
-
- /* ======================================================================== */
- int main (argc, argv)
- int argc;
- char **argv;
- {
- int file_count = 0; /* number of files to precess */
- int proglen; /* length of progname */
- int optc; /* current option */
-
- EXPAND(argc, argv); /* wild card expansion if necessary */
-
- progname = basename(argv[0]);
- proglen = strlen(progname);
-
- /* Suppress .exe for MSDOS, OS/2 and VMS: */
- if (proglen > 4 && strequ(progname+proglen-4, ".exe")) {
- progname[proglen-4] = '\0';
- }
-
- /* Add options in GZIP environment variable if there is one */
- env = add_envopt(&argc, &argv, OPTIONS_VAR);
- if (env != NULL) args = argv;
-
- foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
- if (foreground) {
- signal (SIGINT, (sig_type)abort_gzip);
- }
- #ifdef SIGTERM
- signal(SIGTERM, (sig_type)abort_gzip);
- #endif
- #ifdef SIGHUP
- signal(SIGHUP, (sig_type)abort_gzip);
- #endif
-
- #ifndef GNU_STANDARD
- /* For compatibility with old compress, use program name as an option.
- * If you compile with -DGNU_STANDARD, this program will behave as
- * gzip even if it is invoked under the name gunzip or zcat.
- *
- * Systems which do not support links can still use -d or -dc.
- * Ignore an .exe extension for MSDOS, OS/2 and VMS.
- */
- if ( strncmp(progname, "un", 2) == 0 /* ungzip, uncompress */
- || strncmp(progname, "gun", 3) == 0) { /* gunzip */
- decompress = 1;
- } else if (strequ(progname+1, "cat") /* zcat, pcat */
- || strequ(progname, "gzcat")) { /* gzcat */
- decompress = to_stdout = 1;
- }
- #endif
-
- while ((optc = getopt_long (argc, argv, "b:cdfhLqrtvVZ123456789",
- longopts, (int *)0)) != EOF) {
- switch (optc) {
- case 'b':
- maxbits = atoi(optarg);
- break;
- case 'c':
- to_stdout = 1; break;
- case 'd':
- decompress = 1; break;
- case 'f':
- force++; break;
- case 'h':
- help(); do_exit(OK); break;
- case 'L':
- license(); do_exit(OK); break;
- case 'q':
- quiet = 1; verbose = 0; break;
- case 'r':
- #ifdef NO_DIR
- fprintf(stderr, "%s: -r not supported on this system\n", progname);
- usage();
- do_exit(ERROR); break;
- #else
- recursive = 1; break;
- #endif
- case 't':
- test = decompress = to_stdout = 1;
- break;
- case 'v':
- verbose++; quiet = 0; break;
- case 'V':
- version(); quit_on_tty = 1; break;
- case 'Z':
- #ifdef LZW
- do_lzw = 1; break;
- #else
- fprintf(stderr, "%s: -Z not supported in this version\n",
- progname);
- usage();
- do_exit(ERROR); break;
- #endif
- case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- level = optc - '0';
- break;
- default:
- /* Error message already emitted by getopt_long. */
- usage();
- do_exit(ERROR);
- }
- } /* loop on all arguments */
-
- file_count = argc - optind;
-
- if (do_lzw && !decompress) work = lzw;
-
- /* Allocate all global buffers (for DYN_ALLOC option) */
- ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
- ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
- ALLOC(ush, d_buf, DIST_BUFSIZE);
- ALLOC(uch, window, 2L*WSIZE);
- #ifndef MAXSEG_64K
- ALLOC(ush, tab_prefix, 1L<<BITS);
- #else
- ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
- ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
- #endif
-
- /* And get to work */
- if (file_count != 0) {
- if (to_stdout && !test) {
- SET_BINARY_MODE(fileno(stdout));
- }
- while (optind < argc) {
- treat_file(argv[optind++]);
- }
- } else { /* Standard input */
- treat_stdin();
- }
- do_exit(exit_code);
- return exit_code; /* just to avoid lint warning */
- }
-
- /* ========================================================================
- * Compress or decompress stdin
- */
- local void treat_stdin()
- {
- if (isatty(fileno((FILE *)(decompress ? stdin : stdout)))) {
- /* Do not send compressed data to the terminal or read it from
- * the terminal. We get here when user invoked the program
- * without parameters, so be helpful. However, on systems supporting
- * pseudo ttys, let the beginner stare at the 'hung' program
- * (explicity request from Noah Friedman). Don't give an error message
- * if the user only wanted the version number (gzip -V).
- */
- if (quit_on_tty) do_exit(OK);
- #ifdef NO_PTY
- fprintf(stderr,
- "%s: compressed data not %s a terminal. Redirect %s file or pipe.\n",
- progname, decompress ? "read from" : "written to",
- decompress ? "from" : "to");
- fprintf(stderr,"For help, type: %s -h\n", progname);
- do_exit(ERROR);
- #endif
- }
-
- SET_BINARY_MODE(fileno(stdin));
- if (!test) SET_BINARY_MODE(fileno(stdout));
-
- strcpy(ifname, "stdin");
- strcpy(ofname, "stdout");
-
- /* Get the time stamp on the input file */
- #ifdef NO_STDIN_FSTAT
- time_stamp = 0; /* time unknown */
- #else
- if (fstat(fileno(stdin), &istat) != 0) {
- error("fstat(stdin)");
- }
- time_stamp = istat.st_mtime;
- #endif
- ifile_size = -1L; /* convention for unknown size */
-
- clear_bufs(); /* clear input and output buffers */
- to_stdout = 1;
- part_nb = 0;
-
- if (decompress) {
- method = get_method(ifd);
- if (method < 0) {
- do_exit(exit_code); /* error message already emitted */
- }
- }
-
- /* Actually do the compression/decompression. Loop over zipped members.
- */
- for (;;) {
- (*work)(fileno(stdin), fileno(stdout));
-
- if (!decompress || last_member || inptr == insize) break;
- /* end of file */
-
- method = get_method(ifd);
- if (method == -1) return; /* error message already emitted */
- bytes_out = 0; /* required for length check */
- }
-
- if (verbose) {
- if (test) {
- fprintf(stderr, " OK");
-
- } else if (!decompress) {
- fprintf(stderr, "Compression: ");
- display_ratio(bytes_in-bytes_out-overhead, bytes_in);
- }
- fprintf(stderr, "\n");
- }
- }
-
- /* ========================================================================
- * Compress or decompress the given file
- */
- local void treat_file(iname)
- char *iname;
- {
- /* Check if the input file is present, set ifname and istat: */
- if (get_istat(iname, &istat) != 0) return;
-
- /* If the input name is that of a directory, recurse or ignore: */
- if (S_ISDIR(istat.st_mode)) {
- #ifndef NO_DIR
- if (recursive) {
- struct stat st;
- st = istat;
- treat_dir(iname);
- /* Warning: ifname is now garbage */
- reset_times (iname, &st);
- } else
- #endif
- WARN((stderr,"%s: %s is a directory -- ignored\n", progname, ifname));
- return;
- }
- if (!S_ISREG(istat.st_mode)) {
- WARN((stderr,
- "%s: %s is not a directory or a regular file - ignored\n",
- progname, ifname));
- return;
- }
- if (istat.st_nlink > 1 && !to_stdout && !force) {
- WARN((stderr, "%s: %s has %d other link%c -- unchanged\n",
- progname, ifname,
- (int)istat.st_nlink - 1, istat.st_nlink > 2 ? 's' : ' '));
- return;
- }
-
- ifile_size = istat.st_size;
- time_stamp = istat.st_mtime;
-
- /* Generate output file name */
- if (to_stdout) {
- strcpy(ofname, "stdout");
-
- } else if (make_ofname() != 0) {
- return;
- }
-
- /* Open the input file and determine compression method. The mode
- * parameter is ignored but required by some systems (VMS).
- */
- ifd = open(ifname, O_RDONLY | O_BINARY, RW_USER);
- if (ifd == -1) {
- perror(ifname);
- exit_code = ERROR;
- return;
- }
- clear_bufs(); /* clear input and output buffers */
- part_nb = 0;
-
- if (decompress) {
- method = get_method(ifd); /* updates ofname if original given */
- if (method < 0) {
- close(ifd);
- return; /* error message already emitted */
- }
- }
-
- /* If compressing to a file, check if ofname is not ambiguous
- * because the operating system truncates names. Otherwise, generate
- * a new ofname and save the original name in the compressed file.
- */
- if (to_stdout) {
- ofd = fileno(stdout);
- /* keep remove_ofname as zero */
- } else {
- if (create_outfile() == -1) return;
-
- if (save_orig_name && !verbose && !quiet) {
- fprintf(stderr, "%s: %s compressed to %s\n",
- progname, ifname, ofname);
- }
- }
- if (verbose) {
- fprintf(stderr, "%s:\t%s", ifname, (int)strlen(ifname) >= 15 ?
- "" : ((int)strlen(ifname) >= 7 ? "\t" : "\t\t"));
- }
-
- /* Actually do the compression/decompression. Loop over zipped members.
- */
- for (;;) {
- (*work)(ifd, ofd);
-
- if (!decompress || last_member || inptr == insize) break;
- /* end of file */
-
- method = get_method(ifd);
- if (method < 0) break; /* error message already emitted */
- bytes_out = 0; /* required for length check */
- }
-
- close(ifd);
- if (!to_stdout && close(ofd)) {
- write_error();
- }
- if (method == -1) return; /* error, don't display success msg */
-
- /* Display statistics */
- if(verbose) {
- if (!decompress) {
- display_ratio(bytes_in-bytes_out-overhead, bytes_in);
- }
- if (test) {
- fprintf(stderr, " OK");
- } else if (!to_stdout) {
- fprintf(stderr, " -- replaced with %s", ofname);
- }
- fprintf(stderr, "\n");
- }
- /* Copy modes, times, ownership */
- if (!to_stdout) {
- copy_stat(&istat);
- }
- }
-
- /* ========================================================================
- * Create the output file. Return 0 for success, -1 for error.
- * Try twice if ofname is exactly one beyond the name limit, to avoid
- * creating a compressed file of name "1234567890123."
- * We could actually loop more than once if the user gives an extra long
- * name, but I prefer generating an error then. (Posix forbids the system
- * to truncate names.) The error message is generated by check_ofname()
- * in this case.
- * IN assertions: the input file has already been open (ifd is set) and
- * ofname has already been updated if there was an original name.
- * OUT assertions: ifd and ofd are closed in case of error.
- */
- local int create_outfile()
- {
- struct stat ostat; /* stat for ofname */
- int n; /* loop counter */
-
- for (n = 1; n <= 2; n++) {
- if (check_ofname() == -1) {
- close(ifd);
- return -1;
- }
- /* Create the output file */
- remove_ofname = 1;
- ofd = open(ofname, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, RW_USER);
- if (ofd == -1) {
- perror(ofname);
- close(ifd);
- exit_code = ERROR;
- return -1;
- }
-
- /* Check for name truncation on new file (1234567890123.z) */
- if (fstat(ofd, &ostat) != 0) {
- fprintf(stderr, "%s: ", progname);
- perror(ofname);
- close(ifd); close(ofd);
- unlink(ofname);
- exit_code = ERROR;
- return -1;
- }
- if (!name_too_long(ofname, &ostat)) return 0;
-
- if (decompress) {
- /* name might be too long if an original name was saved */
- WARN((stderr, "%s: %s: warning, name truncated\n",
- progname, ofname));
- return 0;
- } else {
- #ifdef NO_MULTIPLE_DOTS
- /* Should never happen, see check_ofname() */
- fprintf(stderr, "%s: %s: name too long\n", progname, ofname);
- do_exit(ERROR);
- #else
- close(ofd);
- unlink(ofname);
- save_orig_name = 1;
- strcpy(ofname+strlen(ofname)-Z_LEN-1, Z_SUFFIX);
- /* 1234567890123.z -> 123456789012.z */
- #endif
- } /* decompress ? */
- } /* for (n) */
-
- close(ifd);
- fprintf(stderr, "%s: %s: name too long\n", progname, ofname);
- exit_code = ERROR;
- return -1;
- }
-
- /* ========================================================================
- * Use lstat if available, except for -c or -f. Use stat otherwise.
- * This allows links when not removing the original file.
- */
- local int do_stat(name, sbuf)
- char *name;
- struct stat *sbuf;
- {
- #if (defined(S_IFLNK) || defined (S_ISLNK)) && !defined(NO_SYMLINK)
- if (!to_stdout && !force) {
- return lstat(name, sbuf);
- }
- #endif
- return stat(name, sbuf);
- }
-
- /* ========================================================================
- * Return a pointer to the 'z' suffix of a file name, or NULL.
- * For all systems, ".z", ".Z", ".taz", ".tgz", "-z" are accepted suffixes.
- * ".tgz" is a useful convention for tar.z files on systems limited
- * to 3 characters extensions. On such systems, ".?z" and ".??z" are
- * also accepted suffixes. For Unix, we do not want to accept any
- * .??z suffix as indicating a compressed file; some people use .xyz
- * to denote volume data.
- */
- local char *get_suffix(name)
- char *name;
- {
- int len;
- char *p = strrchr(name, '.');
- char suffix[10]; /* last few chars of name, forced to lower case */
-
- if (p == NULL || p == name || strchr(p-1, PATH_SEP) != NULL) return NULL;
- strncpy(suffix, p, sizeof(suffix));
- suffix[sizeof(suffix)-1] = '\0'; /* Force null termination */
-
- #ifdef SUFFIX_SEP
- /* strip a version number from the file name */
- {
- char *v = strrchr(suffix, SUFFIX_SEP);
- if (v != NULL) *v = '\0';
- }
- #endif
- strlwr(suffix);
- if (strequ(suffix, ".z") || strequ(suffix, ".zip")
- || strequ(suffix, ".tgz") || strequ(suffix, ".taz")) {
- return p;
- }
- len = strlen(suffix);
- if (len <= 2) return NULL;
-
- if (strequ(suffix+len-2, "-z")) return p+len-2;
- #ifdef MAX_EXT_CHARS
- if (suffix[len-1] == 'z') return p+len-1;
- #endif
- return NULL;
- }
-
-
- /* ========================================================================
- * Set ifname to the input file name (with .z appended if necessary)
- * and istat to its stats. Return 0 if ok, -1 if error.
- */
- local int get_istat(iname, sbuf)
- char *iname;
- struct stat *sbuf;
- {
- int iexists; /* set if iname exists */
- int ilen = strlen(iname);
- char *suff;
-
- strcpy(ifname, iname);
- errno = 0;
-
- /* If input file exists, return OK. */
- if (do_stat(ifname, sbuf) == 0) return 0;
-
- if (!decompress || errno != ENOENT) {
- perror(ifname);
- exit_code = ERROR;
- return -1;
- }
- /* file.ext doesn't exist, try file.ext.z and file.ext.Z. For MSDOS
- * try file.exz, for VMS try file.ext-z.
- */
- suff = get_suffix(ifname);
- if (suff != NULL) {
- perror(ifname); /* ifname already has z suffix and does not exist */
- exit_code = ERROR;
- return -1;
- }
- #ifdef SUFFIX_SEP
- /* strip a version number from the input file name */
- if ((suff = strrchr(ifname, SUFFIX_SEP)) != NULL) *suff = '\0';
- #endif
- if (strrchr(ifname, '.') != NULL) {
- strcat(ifname, Z_SUFFIX);
- ilen += Z_LEN;
- } else {
- strcat(ifname, ".z");
- ilen += 2;
- }
- errno = 0;
- iexists = !do_stat(ifname, sbuf);
- if (!iexists) {
- errno = 0;
- ifname[ilen-1] = 'Z';
- iexists = !do_stat(ifname, sbuf);
- }
- #ifdef NO_MULTIPLE_DOTS
- /* One more try just to be nice to you */
- if (!iexists) {
- char c = ifname[ilen-2];
- errno = 0;
- strcpy(ifname+ilen-2, "z");
- iexists = !do_stat(ifname, sbuf);
- if (!iexists) {
- ifname[ilen-2] = c;
- }
- }
- #endif
- if (!iexists) {
- ifname[ilen-1] = 'z';
- perror(ifname);
- exit_code = ERROR;
- return -1;
- }
- if (!S_ISREG (sbuf->st_mode)) {
- WARN((stderr, "%s: %s: not a regular file -- ignored\n",
- progname, ifname));
- return -1;
- }
- return 0; /* ok */
- }
-
- /* ========================================================================
- * Generate ofname given ifname. Return 0 if ok, -1 if file must be skipped.
- * Initializes save_orig_name.
- * IN assertion: this function is not called if to_stdout is true.
- */
- local int make_ofname()
- {
- char *suff; /* ofname z suffix */
-
- strcpy(ofname, ifname);
- suff = get_suffix(ofname);
-
- if (decompress) {
- if (suff == NULL) {
- WARN((stderr,"%s: %s: no z suffix -- ignored\n",
- progname, ifname));
- return -1;
- }
- /* Make a special case for .tgz and .taz: */
- strlwr(suff);
- if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
- strcpy(suff, ".tar");
- } else {
- *suff = '\0'; /* strip z suffix and optional version number */
- }
- /* ofname might be changed later if infile contains an original name */
-
- } else if (suff != NULL) {
- /* Avoid annoying messages with -r (see treat_dir()) */
- if (verbose || (!recursive && !quiet)) {
- fprintf(stderr, "%s: %s already has %s suffix -- unchanged\n",
- progname, ifname, suff);
- }
- if (exit_code == OK) exit_code = WARNING;
- return -1;
- } else {
- save_orig_name = 0;
-
- #ifdef SUFFIX_SEP
- /* strip a version number from the file name */
- if ((suff = strrchr(ofname, SUFFIX_SEP)) != NULL) *suff = '\0';
- #endif
-
- #ifdef NO_MULTIPLE_DOTS
- suff = strrchr(ofname, '.');
- if (suff != NULL) {
- # ifdef MAX_EXT_CHARS
- /* On the Atari and some versions of MSDOS, name_too_long()
- * does not work correctly because of a bug in stat(). So we
- * must truncate here.
- */
- if (strlen(suff) > MAX_EXT_CHARS) {
- strcpy(suff + MAX_EXT_CHARS, do_lzw ? "Z" : "z");
- save_orig_name = 1;
- return 0;
- }
- # endif
- strcat(ofname, Z_SUFFIX);
- return 0;
- }
- #endif
- strcat(ofname, do_lzw ? ".Z" : ".z");
-
- } /* decompress ? */
- return 0;
- }
-
-
- /* ========================================================================
- * Check the magic number of the input file and update ofname if an
- * original name was given and to_stdout is not set.
- * Return the compression method, -1 for error, -2 for warning.
- * Set inptr to the offset of the next byte to be processed.
- * This function may be called repeatedly for an input file consisting
- * of several contiguous gzip'ed members.
- * IN assertions: there is at least one remaining compressed member.
- * If the member is a zip file, it must be the only one.
- */
- local int get_method(in)
- int in; /* input file descriptor */
- {
- uch flags;
- char magic[2]; /* magic header */
-
- magic[0] = (char)get_byte();
- magic[1] = (char)get_byte();
-
- time_stamp = istat.st_mtime; /* may be modified later for some methods */
- method = -1; /* unknown yet */
- part_nb++; /* number of parts in gzip file */
- last_member = RECORD_IO;
- /* assume multiple members in gzip file except for record oriented I/O */
-
- if (memcmp(magic, GZIP_MAGIC, 2) == 0
- || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
-
- work = unzip;
- method = (int)get_byte();
- flags = (uch)get_byte();
-
- if ((flags & ENCRYPTED) != 0) {
- fprintf(stderr,
- "%s: %s is encrypted -- get newer version of gzip\n",
- progname, ifname);
- exit_code = ERROR;
- return -1;
- }
- if ((flags & CONTINUATION) != 0) {
- fprintf(stderr,
- "%s: %s is a a multi-part gzip file -- get newer version of gzip\n",
- progname, ifname);
- exit_code = ERROR;
- if (force <= 1) return -1;
- }
- if ((flags & RESERVED) != 0) {
- fprintf(stderr,
- "%s: %s has flags 0x%x -- get newer version of gzip\n",
- progname, ifname, flags);
- exit_code = ERROR;
- if (force <= 1) return -1;
- }
- time_stamp = (ulg)get_byte();
- time_stamp |= ((ulg)get_byte()) << 8;
- time_stamp |= ((ulg)get_byte()) << 16;
- time_stamp |= ((ulg)get_byte()) << 24;
-
- (void)get_byte(); /* Ignore extra flags for the moment */
- (void)get_byte(); /* Ignore OS type for the moment */
-
- if ((flags & CONTINUATION) != 0) {
- unsigned part = (unsigned)get_byte();
- part |= ((unsigned)get_byte())<<8;
- if (verbose) {
- fprintf(stderr,"%s: %s: part number %u\n",
- progname, ifname, part);
- }
- }
- if ((flags & EXTRA_FIELD) != 0) {
- unsigned len = (unsigned)get_byte();
- len |= ((unsigned)get_byte())<<8;
- if (verbose) {
- fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
- progname, ifname, len);
- }
- while (len--) (void)get_byte();
- }
-
- /* Get original file name if it was truncated */
- if ((flags & ORIG_NAME) != 0) {
- if (to_stdout || part_nb > 1) {
- /* Discard the old name */
- while (get_byte() != 0) /* null */ ;
- } else {
- /* Copy the base name. Keep a directory prefix intact. */
- char *p = basename(ofname);
- for (;;) {
- *p = (char)get_byte();
- if (*p++ == '\0') break;
- if (p >= ofname+sizeof(ofname)) {
- error("corrupted input -- file name too large");
- }
- }
- } /* to_stdout */
- } /* orig_name */
-
- /* Discard file comment if any */
- if ((flags & COMMENT) != 0) {
- while (get_byte() != 0) /* null */ ;
- }
-
- } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
- && memcmp(inbuf, PKZIP_MAGIC, 4) == 0) {
- /* To simplify the code, we support a zip file when alone only.
- * We are thus guaranteed that the entire local header fits in inbuf.
- */
- inptr = 0;
- work = unzip;
- if (check_zipfile(in) == -1) return -1;
- /* check_zipfile may get ofname from the local header */
- last_member = 1;
-
- } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
- work = unpack;
- method = PACKED;
- } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
- work = unlzw;
- method = COMPRESSED;
- last_member = 1;
- }
- if (method >= 0) return method;
- if (part_nb == 1) {
- fprintf(stderr, "%s: %s is not in gzip format\n", progname, ifname);
- exit_code = ERROR;
- return -1;
- } else {
- WARN((stderr, "%s: %s: trailing garbage ignored\n", progname, ifname));
- return -2;
- }
- }
-
- /* ========================================================================
- * Return true if the two stat structures correspond to the same file.
- */
- local int same_file(stat1, stat2)
- struct stat *stat1;
- struct stat *stat2;
- {
- return stat1->st_mode == stat2->st_mode
- && stat1->st_ino == stat2->st_ino
- && stat1->st_dev == stat2->st_dev
- && stat1->st_uid == stat2->st_uid
- && stat1->st_gid == stat2->st_gid
- && stat1->st_size == stat2->st_size
- && stat1->st_atime == stat2->st_atime
- && stat1->st_mtime == stat2->st_mtime
- && stat1->st_ctime == stat2->st_ctime;
- }
-
- /* ========================================================================
- * Return true if a file name is ambiguous because the operating system
- * truncates file names.
- */
- local int name_too_long(name, statb)
- char *name; /* file name to check */
- struct stat *statb; /* stat buf for this file name */
- {
- int s = strlen(name);
- char c = name[s-1];
- struct stat tstat; /* stat for truncated name */
- int res;
-
- tstat = *statb; /* Just in case OS does not fill all fields */
- name[s-1] = '\0';
- res = stat(name, &tstat) == 0 && same_file(statb, &tstat);
- name[s-1] = c;
- return res;
- }
-
- /* ========================================================================
- * If compressing to a file, check if ofname is not ambigous
- * because the operating system truncates names. Otherwise, generate
- * a new ofname and save the original name in the compressed file.
- * If the compressed file already exists, ask for confirmation.
- * The check for name truncation is made dynamically, because different
- * file systems on the same OS might use different truncation rules (on SVR4
- * s5 truncates to 14 chars and ufs does not truncate).
- * This function returns -1 if the file must be skipped, and
- * updates save_orig_name if necessary.
- * IN assertions: save_orig_name is already set if ofname has been
- * already truncated because of NO_MULTIPLE_DOTS. The input file has
- * already been open and istat is set.
- */
- local int check_ofname()
- {
- int s = strlen(ofname);
- struct stat ostat; /* stat for ofname */
-
- if (stat(ofname, &ostat) != 0) return 0;
-
- /* Check for name truncation on existing file: */
- #ifdef NO_MULTIPLE_DOTS
- if (!decompress && name_too_long(ofname, &ostat)) {
- #else
- if (!decompress && s > 8 && name_too_long(ofname, &ostat)) {
- #endif
- save_orig_name = 1;
- #ifdef NO_MULTIPLE_DOTS
- strcpy(ofname+s-Z_LEN-1, Z_SUFFIX); /* f.extz -> f.exz */
- #else
- strcpy(ofname+s-4, ".z"); /* 12345678901234.z -> 123456789012.z */
- #endif
- if (stat(ofname, &ostat) != 0) return 0;
- } /* !decompress && name_too_long */
-
- /* Check that the input and output files are different (could be
- * the same by name truncation or links).
- */
- if (same_file(&istat, &ostat)) {
- fprintf(stderr, "%s: %s and %s are the same file\n",
- progname, ifname, ofname);
- exit_code = ERROR;
- return -1;
- }
- /* Ask permission to overwrite the existing file */
- if (!force) {
- char response[80];
- strcpy(response,"n");
- fprintf(stderr, "%s: %s already exists;", progname, ofname);
- if (foreground && isatty(fileno(stdin))) {
- fprintf(stderr, " do you wish to overwrite (y or n)? ");
- fflush(stderr);
- (void)read(fileno(stdin), response, sizeof(response));
- }
- if (tolow(*response) != 'y') {
- fprintf(stderr, "\tnot overwritten\n");
- if (exit_code == OK) exit_code = WARNING;
- return -1;
- }
- }
- (void) chmod(ofname, 0777);
- if (unlink(ofname)) {
- fprintf(stderr, "%s: ", progname);
- perror(ofname);
- exit_code = ERROR;
- return -1;
- }
- return 0;
- }
-
-
- /* ========================================================================
- * Set the access and modification times from the given stat buffer.
- */
- local void reset_times (name, statb)
- char *name;
- struct stat *statb;
- {
- #ifndef NO_UTIME
- struct utimbuf timep;
-
- /* Copy the time stamp */
- timep.actime = statb->st_atime;
- timep.modtime = statb->st_mtime;
-
- if (utime(name, &timep)) {
- WARN((stderr, "%s: ", progname));
- if (!quiet) perror(ofname);
- }
- #else
- name = name; statb = statb; /* avoid warnings */
- #endif
- }
-
-
- /* ========================================================================
- * Copy modes, times, ownership from input file to output file.
- * IN assertion: to_stdout is false.
- */
- local void copy_stat(ifstat)
- struct stat *ifstat;
- {
- #ifndef NO_UTIME
- time_t diff = ifstat->st_mtime - time_stamp;
-
- if (diff < 0) diff = -diff;
- if (decompress && diff > 60 && time_stamp != 0) {
- ifstat->st_mtime = time_stamp;
- if (verbose) {
- fprintf(stderr, "%s: time stamp restored\n", ofname);
- }
- }
- reset_times(ofname, ifstat);
- #endif
- /* Copy the protection modes */
- if (chmod(ofname, ifstat->st_mode & 07777)) {
- WARN((stderr, "%s: ", progname));
- if (!quiet) perror(ofname);
- }
- #ifndef NO_CHOWN
- chown(ofname, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
- #endif
- remove_ofname = 0;
- /* It's now safe to remove the input file: */
- (void) chmod(ifname, 0777);
- if (unlink(ifname)) {
- WARN((stderr, "%s: ", progname));
- if (!quiet) perror(ifname);
- }
- }
-
- #ifndef NO_DIR
-
- /* ========================================================================
- * Recurse through the given directory. This code is taken from ncompress.
- */
- local void treat_dir(dir)
- char *dir;
- {
- dir_type *dp;
- DIR *dirp;
- char nbuf[MAX_PATH_LEN];
-
- dirp = opendir(dir);
-
- if (dirp == NULL) {
- fprintf(stderr, "%s: %s unreadable\n", progname, dir);
- exit_code = ERROR;
- return ;
- }
- /*
- ** WARNING: the following algorithm could occasionally cause
- ** compress to produce error warnings of the form "<filename>.z
- ** already has .z suffix - ignored". This occurs when the
- ** .z output file is inserted into the directory below
- ** readdir's current pointer.
- ** These warnings are harmless but annoying, so they are suppressed
- ** with option -r (except when -v is on). An alternative
- ** to allowing this would be to store the entire directory
- ** list in memory, then compress the entries in the stored
- ** list. Given the depth-first recursive algorithm used here,
- ** this could use up a tremendous amount of memory. I don't
- ** think it's worth it. -- Dave Mack
- ** (An other alternative might be two passes to avoid depth-first.)
- */
-
- while ((dp = readdir(dirp)) != NULL) {
-
- if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) {
- continue;
- }
- if (((int)strlen(dir) + NLENGTH(dp) + 1) < (MAX_PATH_LEN - 1)) {
- strcpy(nbuf,dir);
- if (strlen(dir) != 0) { /* dir = "" means current dir on Amiga */
- #ifdef OTHER_PATH_SEP
- if (dir[strlen(dir)-1] != OTHER_PATH_SEP)
- #endif
- strcat(nbuf,"/");
- }
- strcat(nbuf,dp->d_name);
- treat_file(nbuf);
- } else {
- fprintf(stderr,"%s: %s/%s: pathname too long\n",
- progname, dir, dp->d_name);
- exit_code = ERROR;
- }
- }
- closedir(dirp);
- }
- #endif /* ? NO_DIR */
-
- /* ========================================================================
- * Free all dynamically allocated variables and exit with the given code.
- */
- local void do_exit(exitcode)
- int exitcode;
- {
- if (env != NULL) free(env), env = NULL;
- if (args != NULL) free(args), args = NULL;
- FREE(inbuf);
- FREE(outbuf);
- FREE(d_buf);
- FREE(window);
- #ifndef MAXSEG_64K
- FREE(tab_prefix);
- #else
- FREE(tab_prefix0);
- FREE(tab_prefix1);
- #endif
- exit(exitcode);
- }
-
- /* ========================================================================
- * Signal and error handler.
- */
- RETSIGTYPE abort_gzip()
- {
- if (remove_ofname) {
- close(ofd);
- unlink (ofname);
- }
- do_exit(ERROR);
- }
-